Organisation internationale de normalisation
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MaintenanceSeungkwon Beack, ETRI, presented
The presenter reminded Audio experts that, at the 113th meeting, the MPEG Surround specification was revised to permit greater flexibility with respect to MPEG Surround internal sampling rate and number of QMF bands. Specifically, to support 64 QMF bands permits it to interface directly with MPEG-H 3D Audio in the QMF domain. It presents listening test results that document the performance of this operation point. Systems under test
Mushra test results showed
In conclusion, test results showed that current spec works. Adrian Murtaza, FhG-IIS, presented
The contribution relates to the internal sampling rate issue addressed by the previous contribution. Specifically, it mandates that MPEG-H 3D Audio shall only be used with MPEG Surround when MPEG Surround is in 64-band QMF mode. It was the consensus of the Audio subgroup to incorporate the contribution into a Study on DAM3 for MPEG-D MPEG Surround. Adrian Murtaza, FhG-IIS, presented
This contribution is a draft for what will become MPEG-D SAOC Second Edition. This Draft Second Edition contains:
The Chair thanks Audio experts for undertaking the roll-up to make the SAOC Second Edition. Adrian Murtaza, FhG-IIS, presented
The contribution proposes additional corrections to be added to the SAOC Defect Report from the 106th and 112th meeting to make the text of a DCOR 3 to issue from this meeting. Corrections are:
It was the consensus of the Audio subgroup to incorporate the text from the two defect reports (from the 106th and 112th meetings) and the corrections in this contribution into a DCOR 3 to issue from this meeting. Adrian Murtaza, FhG-IIS, presented
The contribution related to Conformance, and proposes corrections to the
It was the consensus of the Audio subgroup to make the contribution a Study on DAM4 for MPEG-D SAOC. The conformance streams are already on the MPEG SVN server, as indicated in the Study On text. Adrian Murtaza, FhG-IIS, presented
The contribution related to Reference Software, and proposed several corrections and additional functionality to the Reference Software. It was the consensus of the Audio subgroup to make the contribution a Study on DAM5 for MPEG-D SAOC. The reference software is already on the MPEG SVN server, as indicated in the Study On text. Christof Fersch, Dolby, gave a verbal presentation of
The one conformance stream previously identified as a problem, was re-defined and re-generated so as to resolve all issues. Yuki Yamamoto, Sony, gave a verbal presentation of
Sony experts confirmed that the new conformance stream was able to be decoded successfully. The Chair noted that the fully correct and cross-checked set of USAC conformance streams will be made available attached to ISO/IEC 23003-3:2012/AMD 1 COR 2, Corrections to Conformance. This will be re-visited when the DoC on DCOR 2 is reviewed. Max Neuendorf, FhG-IIS, presented
The contribution describes and clarifies numerous situations that arise in streaming use cases involving USAC. The contribution proposes to add text to
It was the consensus of the Audio subgroup to incorporate the contribution text into ISO/IEC 23003-3:2012/FDAM 3, Support for MPEG-D DRC and IPF. Michael Kratschmer, FhG-IIS, presented
The presenter gave a brief overview of how MPEG-D DRC works and what it can be used for. He further noted that peak limiting and clipping prevention is typically out of scope for most MPEG audio decoders. The contribution specifically addresses the prevention of peak limiting, via the specification of a new parametric DRC type for peak limiting. This new functionality does not require any new tools or architecture. What is required is a new playload that contains
It was the consensus of the Audio subgroup to incorporate the contribution text into ISO/IEC 23003-4:2015 DAM 1, Parametric DRC, Gain Mapping and Equalization Tools, to be produced at this meeting. Michael Kratschmer, FhG-IIS, presented
The contribution notes that each DRC configuration requires a separate metadata set. It proposes to adopt the downmixld mechanism for downmix configurations into a new drcSetId for DRC configurations. This does not require a syntax change, only a semantics change. It was the consensus of the Audio subgroup to incorporate the contribution text into a Defect Report on MPEG-D DRC. Frank Baumgarte, Apple, presented
The presenter reviewed that the PDAM 1 text specifies the following tools:
Since the 113th meeting, when the PDAM issued, the technology has been implemented which has identified issues in the specification. Many of those issues are captured in the proposed Study On text. Issues are:
It was the consensus of the Audio subgroup to make the contribution text ISO/IEC 23003-4:2015 DAM 1, Parametric DRC, Gain Mapping and Equalization Tools, to be produced at this meeting. Michael Kratschmer, FhG-IIS, presented
The contribution is a proposed RM7 for MPEG-D DRC Reference Software. It incorporates all tools in DRC including
It was the consensus of the Audio subgroup to add to this the technology in
And issue this as
from this meeting with a
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